Propeller.



E. C. HARRlNGTON.

PROPELLER.

APPLICATION FILED FEB. 15, 1913.

1,]. 60.38%, Patented Nov. 16, 1915.

Attorneys COLUMBIA PLANOGRAPH cm. WASHINGTON, D. c.

EDWARD C." HARRINGTON, OFST. LOUIS, MISSOURI.

PROPELLER.

mousse.

1 b all whom it may concern:

Be it known that I, EDWARD C. HARRING- TON, a citizen of the UnitedStates, residing at St. Louis, in the State of lvlissournhave invented a new and useful Propeller, of which the following is a specification.

This invention relates to propellers.

The object of the present invention is to provide a. propeller of simple construction and one which will eliminate all tendency to slip or churn and therefore the maximum efficiency will be realized.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spiritof the invention.

In the drawings accompanying this specification and forming a part thereof, the preferable form of my invention is illustrated, in which Figure l is a plan view of my improved propeller. Fig. 2 is a side view thereof or a view similar to Fig. 1 in which the propeller has been rotated through 90 degrees. Fig. 3 is an end view thereof. Fig. 4 is a cross sectional view of Fig. 2 on the line A-A. Fig. 5 is a plan view of the blank from which the propeller is formed.

Referring to the drawings in which similar reference numerals designate corresponding parts throughout the several views, A represents the propeller shaft or hub which in the present instance is provided with a.

suitable slot or groove extending centrally thereof and into which is adapted to fit the metallic blank B as illustrated in Fig. 5. The metallic blank B is circular in outline and is formed of sheet metal of suflicient thickness to lend the required strength and rigidity to the propeller when the same has assumed its final form. It is to be noted however that the propeller may be made of cast metal without departing from the spirit of the invention. The said circular blank B is provided with a slotC therein which is in alinement with the propeller shaft A and extends from the center of the blank to the circumference thereof.

In the forming of my improved propeller from a sheet metal blank such as illustrated Specificationpf Letters Patent." Pa iggnted NGVQ 16 1g15 Application filedjFebruary 15, 1913.

Serial No. 748,673.

tial to theline of the propeller shaft A and extend therefrom in a curve such that thepoints 4% at the outer extremities of the line of division C between the blades would when connected with the extremity of the propeller shaft which extends to the center of the propeller blade as illustrated in Fi 5, define an angle of approximately 90 degrees such as is designated in'Fig. 2. The blade 1 is then twisted or turned to form a continuous curve from the point 3 upon the circumference of the blank through approximately 180 degrees to a point diametrically opposite therefrom as at 4. The same pitch is given to each of the blades 1 and 2 and the result thereby obtained is a propeller with a varying pitch and therefore one which will give the maximum efficiency in use and will eliminate all tendency to churn or slip.

From the foregoing it will be apparent that my improved propeller may be cast in the form illustrated in Fig. 2 or formed of a blank as illustrated in Fig. 5 and bent to the desired configuration. Each blade will therefore have a true and constantly varying pitch from the point 3 on the circumference where the propeller shaft intersects the propeller proper and from this point to the outerbent ends 4 of the blade will be a constantly varying pitch which will produce an efficient propeller, the circumference of each blade turning through approximately 180 degrees and the edges of thecut slot C in the blank are bent tangential to the line of the propeller blade shaft and form an angle therewith of approximately 45 degrees, and include between their edges an angle of approximately 90 degrees.

It is to be understood that I do not wish to limit myself to the slotted shaft construction as the same may be varied as illustrated in Fig. a in which the blades of the propeller are made integral with the hub.

Having thus fully disclosed the construction of my improved propeller, what I claim to be new and original with me is 1. A propeller comprising in blank a circular plate, said plate cut along a radial line, a propeller hub secured to said plate extending radially thereof and in alinement with the said cut, the said blank being bent to bring the ends of said out in a direction perpendicular to the plane of the blank defining therebetween an angle of substantially 90 degrees taken with the center of said blank as the apex ofthe angle', the two semi-circular portions of the blank lying upon opposite sides of the cut and propeller hub and being bent to form blades of specific curvature, the said curvature'belng such as would be obtained by holding the eXtremi-,

Copies of this patent may be obtained for through substantially 180 degrees, and with the adjacent extremities of the blades bent in opposite directions to form an angleof substantially 90 degrees therebetween taken With the end of the hub as the apex of the angle. V i c In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

EDl/VARD G. HARRINGTON. Witnesses:

N. E. LURTON, CHAs. A. SMITH.

five cents each, by addressing the Commissioner of Patents, Washington, 110. 

